Mortarpod is pretty amazing with a flipped Garruk Relentless  ^{Flip  Flip}

do you find that you can really get by with only 20 land or do you have to mulligan pretty aggresively?

It's typically mull until you get a land and a mana dork, but with 4x of each, you don't have to mulligan too aggressively. Average mulligan for me over 10 games is 4 times.

I would prefer 4x es flying around, not to mention the hordes of fliers coming in Dark Ascension.

Also, I'm a sucker for Sword of War and Peace paired with Mirran Crusader (over Sword of Feast and Famine) for near-complete protection from colors.

I agree on Razorverge Thicket, I was thinking about using the scars lands on another deck for the same reason; the early WW. As for Ambush Viper, his lack of reach does limit his power considerably, so Insectile Aberrations could be a problem. I am going to playtest having both Ambush Viper and Beast Within, so that I can turn their flying creatures into 3/3 beasts to be killed by Ambush Viper. I like the utility of Sword of Feast and Famine more than the protection, since the boost from Sword of War and Peace is almost miniscule in the late game. I have not considered any DKA cards yet, so I will probably add a few tomorrow when I have more time to go through the DKA spoiler. Thank you very much for the suggestions Graft!

and when equipped to a Garruk, the Veil-Cursed deathtouch wolf, deals with Insectile Aberration too

I see the use, but I simply do not have room for it In this build.

Have you considered Apostle's Blessing or Stave Off to help protect your creatures from removal? Particularly small burn spells or blanket damage on your mana dorks?

I also forgot to mention either of those cards would stop the ever pesky "Tragic Slip your birds." Now that I think of it Autumn's Veil is a damn annoying card to sideboard in as well that would probably be more effective if you don't fear Arc Trail and Gut Shot.

I have been planning on making a sideboard for this deck, and I think Apostle's Blessing will be a good choice for it. I'll try to throw it together today, thanks for the comments!

I have my own Gavony Humans deck and like you I went more towards the non-token side I still have tokens, but they're not the main point of the deck, I found Champion of Lambholt and thought "This is Champion of the Parish but better.]" I think this card might be really broken in some decks.

Yeah, that was my first thought too! I certainly hope it is broken in this deck, I have already pre-ordered them :)

Cavern of Souls?

May I ask why no Champion of the Parish?

I had no idea that Cavern of Souls existed, it looks excellent! I'm sure it will be very expensive, but I'll try to pick up a few copies. And Champion of the Parish doesn't fit in the curve, I need to play a mana dork turn 1 to get Champion of Lambholt or Mirran Crusader out turn 2.

You should pick your favorite sword and put the rest in the sideboard for situations when the'll be useful. For instance, the ability of Sword of Body and Mind isn't nearly as good as the other two. The reason it is good is against blue and green decks. Sword of Feast and Famine is much better, but its abilities are less suited to your needs. I find that Sword of War and Peace, while more expensive to get, is a much better alternative to the others. An example of this is: You are facing a powerful naya-colored deck. You drop Mirran Crusader turn two. Turn three you play Hero of Bladehold. You attack for four damage with your Mirran Crusader. On turn four, you play and equip Sword of War and Peace on your Mirran Crusader, and it becomes virtually unblockable. You attack all out. Good game. This is super possible to happen in any game, against any deck. The lifegain and damage capacity of Sword of War and Peace is unmatched.

Well thank you for the feedback, but I'm already aware of that. I use 4 swords on the mainboard and those just so happen to be the 4 swords that I own. Ideally I would run just Sword of War and Peace on the mainboard, for the 4 color protection on Mirran Crusader and extra damage. However, the untap ability of SoFaF does give me a lot of extra gas, which is more helpful some games. I don't really like SoBaM, but it was cheap to obtain and protection from blue is actually extremely relevant in today's meta with Delver Spirits and his friends showing up at almost every tournament and FNM. Thanks again for the suggestions, if I had more SoWaP, I would definitely move the other swords to the sideboard. Playtesting shows that without at least 4 swords, one almost never shows up, and those are the 4 swords that I have.